Install latest Rstudio Desktop for Debian

#! /bin/env bash
# Install latest Rstudio Desktop for (Debian)
# Licence WTFPL

IF=`
`

# # needs packages
# # util-linux(rev) libxml2-utils(xmllint) gpg coreutils(sha256sum)
# apt-get install -y util-linux libxml2-utils gpg coreutils curl

# # for firest time , get gpg key
gpg --keyserver keyserver.ubuntu.com --recv-keys 3F32EE77E331692F


# OS type,file type
# Windows 10/11,.exe/.zip
# macOS 10.15+,.dmg
# Ubuntu 18+/Debian 10+,.deb/.tar.gz
# Fedora 19/Red Hat 7,.rpm/.tar.gz
# Fedora 34/Red Hat 8,.rpm
# Debian 9,.deb/.tar.gz
# OpenSUSE 15,.rpm

# note Xpath
# URL
# //table/tbody/tr[i]/td[2]/a/@href
# //table/tbody/tr[contains(td[1]/text(), "OS type")]/td[2]/a[contains(@href, "file type")]/@href
# Hash
# //table/tbody/tr[i]/td[4]/a/@data-content
# //table/tbody/tr[contains(td[1]/text(), "OS type"")]/td[2]/a[contains(@href, "file type")]/../../td[4]/a/@data-content


OS='Debian 10'
FILETYPE='.deb'

URL='https://www.rstudio.com/products/rstudio/download/'
HTML=$( curl $URL )
DOWNLOAD_URL=$( echo "$HTML" | xmllint --nowarning --xpath '//tbody/tr[contains(td[1]/text(), "'"$OS"'")]/td[2]/a/@href' --html - | sed 's/href="//g;s/"//g;s/\s/\n/g;s/^.?$//g;s/^\n//g' )
FIELNAME=$( tmp="$(mktemp)" ; echo "$DOWNLOAD_URL" > "$tmp" ; rev < "$tmp" | cut -f1 -d"/" | rev )
HASH=$( echo "$HTML" | xmllint --nowarning --xpath '//table/tbody/tr[contains(td[1]/text(), "'"$OS"'")]/td[2]/a[contains(@href, "'"$FILETYPE"'")]/../../td[4]/a/@data-content' --html - | sed 's/data-content="//g;s/"//g;s/\s/\n/g;s/^.?$//g;s/^\n//g' )
curl -OL "$DOWNLOAD_URL"
hash_check=$( echo "$HASH"  "$FIELNAME" | sha256sum --status -c  ;echo $? )
# hash_check=$(printf "%s  %s" "$HASH" "$FILE" | sha256sum --status -c ;printf "%s" "$?")


if [ "$hash_check" -eq 0 ]; then
    #For Debian/Ubuntu
    gdebi "$FIELNAME"
    #For Red Hat/CentOS/SuSE
    # rpm -K $FIELNAME
elseで
    echo Hash check was failed"$IF"Plase download again"$IF"Hash exit status "$hash_check"
    # printf "Hash check was failed%sPlase download again%sHash exit status %s" "$IF" "$IF" "$hash_check"
fi

# altanative check way for Debian/Ubuntu
# dpkg-sig --verify $FIELNAME

# for Red Hat/CentOS/SuSE
# gpg --export --armor 3F32EE77E331692F > rstudio-signing.key
# rpm --import rstudio-signing.key
# rpm -K $FIELNAME